Writing instrument



FIG. 1 is a front elevational view of a writing instrument showing mynew design, the rear elevational view being a mirror image thereof;

FIG. 2 is a right end elevational view thereof;

FIG. 3 is a left end elevational view thereof; and

FIG. 4 is a top plan view thereof with the cap in an alternate positionto expose the writing point.

The ornamental design for a writing instrument, as shown and described.